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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Human Reproduction of Biology.
181
Both corpus luteum and macula lutea are
[1]
found in human ovaries
[2]
a source of hormones
[3]
characterized by a yellow colour
[4]
contributory in maintaining pregnancy
Answer: characterized by a yellow colour
182
If for some reason, the vasa efferentia in the human reproductive system get blocked, the gametes will not be transported from
[1]
Vagina to uterus
[2]
Testes to epididymis
[3]
Epididymis to vas deferens
[4]
Ovary to uterus
Answer: Testes to epididymis
183
Bartholin’s glands are situated
[1]
on the side of head of some amphibians
[2]
at the reduced tail end of birds
[3]
on either side of vagina in humans
[4]
on either side of vas deferens in humans
Answer: on either side of vagina in humans
184
The secretory phase in the human menstrual cycle is also called
[1]
Luteal phase and lasts for about 6 days
[2]
Follicular phase lasting for about 6 days
[3]
Luteal phase and lasts for about 13 days
[4]
Follicular phase and lasts for about 13 days
Answer: Luteal phase and lasts for about 13 days
185
Which one of the following statements is correct?
[1]
FSH and LH occur in both males and females
[2]
FSH and LH stimulate the follicle to secrete estrogen.
[3]
The ovarian cycle depends on the blood levels of FSH and LH.
[4]
All of these are correct.
Answer: All of these are correct.
186
Which one of the following statement is incorrect?
[1]
Scrotum regulates the temperature of the developing sperm within the testes
[2]
Middle piece of a sperm contains many mitochondria to provide energy for movement
[3]
Epididymis and ductus deferens also store sperm
[4]
Sperm contributes cytoplasm and organelles to zygote
Answer: Sperm contributes cytoplasm and organelles to zygote
187
A protective layer around testes is
[1]
Tunica adventitia
[2]
Tunica media
[3]
Tunica vasculosa
[4]
Tunica albuginea
188
Which one of the following statements about morula in humans is correct?
[1]
It has more cytoplasm and more DNA than an uncleaved zygote
[2]
It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
[3]
It has far less cytoplasm as well as less DNA than in an uncleaved zygote
[4]
It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
Answer: It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
189
Immediately after ovulation, the mammalian egg is covered by a membrane known as:
[1]
Chorion
[2]
Zona pellucida
[3]
Corona radiata
[4]
Vitelline membrane
190
At the time of implantation, the human embryo is called
[1]
zygote
[2]
blastocyst
[3]
embryo
[4]
foetus
191
In spermatogenesis, reduction division of chromosome occurs during conversion of
[1]
Secondary spermatocytes to spermatids
[2]
Primary spermatocytes to secondary spermatocytes
[3]
Spermatogonia to primary spermatocytes
[4]
Spermatids to sperms
Answer: Primary spermatocytes to secondary spermatocytes
192
32-celled stage of human embryo is
[1]
Smaller than fertilized egg
[2]
Same size as fertilized egg
[3]
Two times the size of fertilized egg
[4]
Four times the size of fertilized egg
Answer: Same size as fertilized egg
193
Foramen ovale
[1]
Is a shallow depression in the interventricular septum
[2]
Is a condition in which the heart valves do not completely close
[3]
Is a connection between the pulmonary trunk and the aorta in the fetus
[4]
Connects the two atria in the fetal heart
Answer: Connects the two atria in the fetal heart
194
Vasa efferentia are the ductules leading from
[1]
Epididymis to urethra
[2]
Testicular lobules to rete testis
[3]
Rete testis to vas deferens
[4]
Vas deferens to epididymis
Answer: Rete testis to vas deferens
195
Conversion of spermatids into sperms is
[1]
Spermiogenesis
[2]
Ppermatogenesis
[3]
Gametogenesis
[4]
Metamorphosis
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